<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 1点 */
        .box1 {
            width: 100px;
            height: 100px;
            border: 1px solid #000;
            border-radius: 3px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .box1 .inner {
            width: 50%;
            height: 50%;
            background-color: red;
            border-radius: 50%;
        }

        /* 2点 */
        .box2 {
            width: 100px;
            height: 100px;
            border: 1px solid #000;
            border-radius: 3px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: space-around;
        }

        .box2 .inner {
            width: 33%;
            height: 33%;
            background-color: red;
            border-radius: 50%;
        }

        /* 三点 */
        .box3 {
            width: 100px;
            height: 100px;
            border: 1px solid #000;
            border-radius: 3px;
            display: flex;
            justify-content: space-around;
        }

        .box3 .inner {
            width: 30%;
            height: 30%;
            background-color: red;
            border-radius: 50%;
        }

        .box3 .inner:nth-child(2) {
            align-self: center;
        }

        .box3 .inner:nth-child(3) {
            align-self: self-end;
        }

        /* 4点 */
        .box4 {
            width: 100px;
            height: 100px;
            border: 1px solid #000;
            border-radius: 3px;
            display: flex;
            flex-wrap: wrap;
            align-content: space-evenly;
            justify-content: space-evenly;
        }

        .box4>.inner {
            width: 34%;
            height: 34%;
            background-color: red;
            border-radius: 50%;
        }

        /* 5点 */
        .box5 {
            width: 100px;
            height: 100px;
            border: 1px solid #000;
            border-radius: 3px;
        }
        .box5 .top,.bottom{
            display: flex;
            height: 33%;
            width: 100%;
            justify-content: space-evenly;
        }
        .box5 .middle{
            width: 100%;
            display: flex;
            height: 33%;
            justify-content: center;
            align-items: center;
        }
        .box5 .inner {
            width: 33%;
            height: 100%;
            background-color: red;
            border-radius: 50%;
        }

        /* 6点 */
        .box6 {
            width: 100px;
            height: 100px;
            border: 1px solid #000;
            border-radius: 3px;
            display: flex;
            flex-wrap: wrap;
            align-content: space-evenly;
            justify-content: space-evenly;
        }

        .box6>.inner {
            width: 34%;
            height: 34%;
            background-color: red;
            border-radius: 50%;
        }
    </style>
</head>

<body>
    <!-- 1点 -->
    <div class="box1">
        <div class="inner"></div>
    </div>
    <!-- 2点 -->
    <div class="box2">
        <div class="inner"></div>
        <div class="inner"></div>
    </div>
    <!-- 3点 -->
    <div class="box3">
        <div class="inner"></div>
        <div class="inner"></div>
        <div class="inner"></div>
    </div>
    <!-- 4点 -->
    <div class="box4">
        <div class="inner"></div>
        <div class="inner"></div>
        <div class="inner"></div>
        <div class="inner"></div>
    </div>
    <!-- 5点 -->
    <div class="box5">
        <div class="top">
            <div class="inner"></div>
            <div class="inner"></div>
        </div>
        <div class="middle">
            <div class="inner"></div>
        </div>
        <div class="bottom">
            <div class="inner"></div>
            <div class="inner"></div>
        </div>
    </div>
    <!-- 6点 -->
    <div class="box6">
        <div class="inner"></div>
        <div class="inner"></div>
        <div class="inner"></div>
        <div class="inner"></div>
        <div class="inner"></div>
        <div class="inner"></div>
    </div>
</body>

</html>